[PATCH v9 36/39] dyndbg: Ignore additional arguments from pr_fmt
From: Jim Cromie via B4 Relay
Date: Tue Sep 08 2026 - 21:08:45 EST
From: Philipp Hahn <phahn-oss@xxxxxx>
pr_fmt can be used to add a common prefix to any output from a module:
#define pr_fmt(fmt) KBUILD_MODNAME ".%s " fmt, __func__
But adding additional arguments breaks dynamic debug:
> error: macro "DEFINE_DYNAMIC_DEBUG_METADATA_CLS" passed 4 arguments, but takes just 3
> | pr_debug_ratelimited("%s", "Hello world!");
> | ^
> note: macro "DEFINE_DYNAMIC_DEBUG_METADATA_CLS" defined here
> | #define DEFINE_DYNAMIC_DEBUG_METADATA_CLS(name, cls, fmt) \
> |
> error: ‘DEFINE_DYNAMIC_DEBUG_METADATA_CLS’ undeclared (first use in this function)
> | DEFINE_DYNAMIC_DEBUG_METADATA_CLS(name, _DPRINTK_CLASS_DFLT, fmt)
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> note: in expansion of macro ‘DEFINE_DYNAMIC_DEBUG_METADATA’
> | DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt)); \
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> note: in expansion of macro ‘pr_debug_ratelimited’
> | pr_debug_ratelimited("%s", "Hello world!");
> | ^~~~~~~~~~~~~~~~~~~~
Add an additional ', ...' to DEFINE_DYNAMIC_DEBUG_METADATA_CLS to slurp
any additional argument, which `pr_fmt` might add.
Signed-off-by: Philipp Hahn <phahn-oss@xxxxxx>
[pr_fmt change on test_dynamic_debug_submod instead of parent]
Reviewed-by: Jim Cromie <jim.cromie@xxxxxxxxx>
---
include/linux/dynamic_debug.h | 2 +-
lib/test_dynamic_debug.c | 4 +-
.../selftests/dynamic_debug/dyndbg_selftest.sh | 68 +++++++++++-----------
3 files changed, 37 insertions(+), 37 deletions(-)
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 32a34a80672b..39de59c8bac2 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -364,7 +364,7 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
dump_stack(); \
}
-#define DEFINE_DYNAMIC_DEBUG_METADATA_CLS(name, cls, fmt) \
+#define DEFINE_DYNAMIC_DEBUG_METADATA_CLS(name, cls, fmt, ...) \
static struct _ddebug __aligned(8) \
__section("__dyndbg_descs") name = { \
.modname = DDEBUG_MODNAME, \
diff --git a/lib/test_dynamic_debug.c b/lib/test_dynamic_debug.c
index 97f2c9e1b92b..bce0993443b4 100644
--- a/lib/test_dynamic_debug.c
+++ b/lib/test_dynamic_debug.c
@@ -23,7 +23,7 @@
* the usage clearer.
*/
#if defined(TEST_DYNAMIC_DEBUG_SUBMOD)
- #define pr_fmt(fmt) "test_dd_submod: " fmt
+ #define pr_fmt(fmt) "test_dd_submod: %s " fmt, __func__
#else
#define pr_fmt(fmt) "test_dd: " fmt
#endif
@@ -270,7 +270,7 @@ static int __init test_dynamic_debug_init(void)
static void __exit test_dynamic_debug_exit(void)
{
- pr_debug("exited\n");
+ pr_debug_ratelimited("exited\n");
}
module_init(test_dynamic_debug_init);
diff --git a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
index 25137663d554..9713b13be4e2 100755
--- a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
+++ b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
@@ -691,50 +691,50 @@ function GOLDEN_RECORDS {
#K= cce9c41c3ac297e910c3ee3b10852cb3 FT_multi_query.2
#K= 8c2dd1164fbcefb721345ce62a864a37 FT_multi_query.3
#K= 4542e1e5e7eadcbe8f90a9c934635618 FT_multi_query.4
-#K= 8146f6f983c3a76783c89b78b892ed48 FT_test_classes.1
+#K= fd730021392c7d0044408f304d683c69 FT_test_classes.1
#K= a15ec4843acd721fbdfddc0b512c8032 FT_test_classes.2
#K= bc074e657d8d7f0bbc960e4dfa8de25d FT_test_classes.3
-#K= 878c5b9b20cbe8b93f2f3e92fc8b77bb FT_classmap_inheritance.1
-#K= 0eb7e891704074434646c2340ddac152 FT_classmap_inheritance.2
-#K= a6e6aab5a6cb9a792d4296b1200ba409 FT_classmap_inheritance.3
-#K= 5b6d86bcaa2477699aab655447d780dd FT_classmap_inheritance.4
-#K= f43e0aff8a4b38435b73d90ed8100d1b FT_classmap_inheritance.5
+#K= 824adca66a686b530ae8393351b16ecf FT_classmap_inheritance.1
+#K= c26dcd19a11f51322965a08e1fa5c98e FT_classmap_inheritance.2
+#K= cd150aea538ee12e9c18cafd2c95a39a FT_classmap_inheritance.3
+#K= 3aa6360c73a9509c30fff0c4f95f1607 FT_classmap_inheritance.4
+#K= 62b6803edf43519186d6185bebf34352 FT_classmap_inheritance.5
#K= 94610c57ac44bd7011002a654fd78f93 FT_modprobe_w_param.1
#K= 94610c57ac44bd7011002a654fd78f93 FT_modprobe_w_param.2
-#K= c1309e18dc9bf2f57184fa13164d917d FT_modprobe_w_param.3
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.4
-#K= a1232e658d95fbca8b23a69e9a0db965 FT_modprobe_w_param.5
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.6
-#K= af7b3d532325b1c5ab990e4b32fed577 FT_modprobe_w_param.7
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.8
+#K= 8ce6fcd5958d99524509f8ee8b337762 FT_modprobe_w_param.3
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.4
+#K= e99561131cb0877e244ded16465d17be FT_modprobe_w_param.5
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.6
+#K= a6c1e1585418e199de271b71a9746d93 FT_modprobe_w_param.7
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.8
#K= 591411c42cf52d7c4c46d76bcc345a5f FT_modprobe_w_param.9
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.10
-#K= 46d24fecc507a8f9be0bd120e27ff64f FT_modprobe_w_param.11
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.12
-#K= 79298a323d3dcca4f74fb9fc0de5a87e FT_modprobe_w_param.13
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.14
-#K= f649752dfb07a68087f04dafc00ed1e8 FT_modprobe_w_param.15
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.16
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.10
+#K= b425428024ebf309fd38ac6c67d954ef FT_modprobe_w_param.11
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.12
+#K= 35c26142670166a021b523097db2e418 FT_modprobe_w_param.13
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.14
+#K= 090cde34d0a22f90f2bba1fed561aa9c FT_modprobe_w_param.15
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.16
#K= 73a93377a823739e8aae44856a20fa7f FT_modprobe_w_param.17
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.18
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.18
#K= 10464b2c3e3972f05e93c609700f8fb2 FT_modprobe_w_param.19
#K= 10464b2c3e3972f05e93c609700f8fb2 FT_modprobe_w_param.20
-#K= 07c1f81d5a58675a291dc77acd6938c4 FT_modprobe_w_param.21
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.22
-#K= b070066b0eb13a033446bd05850b15e2 FT_modprobe_w_param.23
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.24
-#K= 32ca47823c27e629e03c21aebfc25095 FT_modprobe_w_param.25
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.26
+#K= 69502938a4be4936847568d8aad027f6 FT_modprobe_w_param.21
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.22
+#K= 51fe322a7f368d936d2292c951247b33 FT_modprobe_w_param.23
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.24
+#K= 91391932971be1d599d19ba04d6f6a34 FT_modprobe_w_param.25
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.26
#K= 7b91db8e9f160aebb1ee87fab2232404 FT_modprobe_w_param.27
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.28
-#K= d3d111da544dd5cee254e88178823b9d FT_modprobe_w_param.29
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.30
-#K= b5a30ebac06aea6e77a44322667effc7 FT_modprobe_w_param.31
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.32
-#K= bbe7b47ed089428429f4264c8cc2a066 FT_modprobe_w_param.33
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.34
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.28
+#K= 9d29af8b8039ca84138b6b030a3b2eb7 FT_modprobe_w_param.29
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.30
+#K= 2a90475b035790006963c6245334edab FT_modprobe_w_param.31
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.32
+#K= b4f6d119e4d5fea58ac3a78f6bd64540 FT_modprobe_w_param.33
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.34
#K= 3d2538bf868e71bff17c768cf118c352 FT_modprobe_w_param.35
-#K= 13c54ef65e199294fd078ba72c0cd69a FT_modprobe_w_param.36
+#K= a6dd47315e45f54d89fd2561f83b9bf0 FT_modprobe_w_param.36
EOF
# Read the K-recs and skip those for tests that can't run
while read -r line; do
--
2.55.0